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NS6+ IE5+ Opera 7+
Textarea Maxlength script
Description: This is a simple but effective script for extending your textarea with a maxlength attribute, so the user's input cannot exceed a certain number of characters. Works with any number of textareas on the page.
Demo: Try typing in the below textareas.
Step 1: Add the below script to the <HEAD> section of your page:
Step 2: Inside any textarea you wish to add a "maxlength" attribute to, simply do the following:
<textarea maxlength="40" onkeyup="return ismaxlength(this)"></textarea>
The part in red is what you should add, with "40" obviously being the maximum number of characters accepted by this textarea.